I bought mine from
www.optcorp.com They are great to deal with and if they have the item in stock it can often be here within a week. Just check with them first if they have them in stock.
there is their 80mm one
http://www.optcorp.com/product.aspx?...5-166-168-9776 which is backordered.
their 60mm
http://www.optcorp.com/product.aspx?...5-166-168-9775 though low in stock
and their 50mm
http://www.optcorp.com/product.aspx?...5-166-168-9755
I have this one with the rotating eyepiece end
http://www.optcorp.com/product.aspx?...5-166-168-8503 but you need to order the illuminator with this on and the finder is on backorder
Just check with them first
ps check to see if they come with the finder bracket or if they will fit your standard finder bracket
the accessories page
http://www.optcorp.com/product.aspx?...-168-8503&tb=5
